:root{--ink:#111214;--muted:#61656d;--line:#dfe2e7;--surface:#f5f7f9;--paper:#fff;--coral:#e6533c;--green:#198754;--blue:#2f6fed;--red:#c83d4b}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--paper);color:var(--ink);letter-spacing:0;margin:0;font-family:Inter,PingFang SC,Microsoft YaHei,Arial,sans-serif}button,a{font:inherit}a{color:inherit;text-decoration:none}.topbar{z-index:20;background:#fffffff0;border-bottom:1px solid #1112141a;justify-content:space-between;align-items:center;height:68px;padding:0 4vw;display:flex;position:sticky;top:0}.brand,.topbar-actions,.demo-status,.hero-actions,.privacy-note,.real-badge{align-items:center;display:flex}.brand{gap:10px;font-size:15px;font-weight:760}.brand-mark{background:var(--ink);color:#fff;border-radius:7px;place-items:center;width:34px;height:34px;display:grid}.topbar-actions{gap:14px}.demo-status{color:var(--muted);gap:7px;font-size:13px}.demo-status 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